Portable planer



Mec. 25 @ggg YORTABLE PLANER Filed out. '7, 1918 atented Bee. 25, i923.

CORPORATION OF OHIO.

hemd@ GEORGE L. KRABBE, OF PORTLAND, OREGON, ASSIGNOR, BY MESNE ASSIGNMENTS, TOv

THE CLEVELAND INDUSTRIAL DEVELOPMENT COMPANY, 0F

CLEVELAND, OHIO, a

PORTABLE PLANEBJ.

Application led October 7, 1918. Serial No. 257,254.

To all who/m 'it may con-cern:

Be it known that l, GEORGE L. KRABER, a citizen of the United States, and a resident of Portland, county of Multnomah, State of Oregon, have invented a certain new and useful Improvement in Portable Planers, of which the following is a specification.

My invention relates to cutter-heads to be driven at a very high speed, and which, in order to do certain kinds of work, require the employment of a knife-element adapted to cut in a plane in parallelism with a face of the surface to be planed.

It has heretofore been attempted to einploy a knife comprising two oppositely disposed cutting members or blades, projecting in a plane in parallelism with said surface; but practice developed the fact that there was a tendency of the knife-blades to become overlieated-in work, and, in this way, lose their temper and eective state in too brief a time.

l have, however, discovered that the overheating may be eliminated by slightly tilting the axis of rotation of the knife out of the perpendicular with respect to the sur face being planed, so that the plane of rotation of the knife-blades will be at a slight angle to said surface. When so arranged the knife-blades or cutting members of the knife will be alternately imposed upon, and cut said surface, or be slightly spaced therefrom for a brief interval, which practicev has demonstrated as eHective for causing a suflicient drop in temperature of the knifeblade not cutting for the time, to prevent the overheating of the knife-blades.

Another object of my invention is to adapt the knife-element to produce a slightly concaved surface, as desirable in the shipbuilding art. In short, in planing the abutting surfaces of timbers and planks it is desirable that the edges of the surfaces project a trifle, and that the intermediate` surface be slightly concaved so as to insure a proper fit o'f the surface planed with the surface against which it is laid. For example, the abutting edge-faces of the planking should be slightly concaved so as to form a pocket, as it were, between them, in which to hold the caulking material; for if there were aV convexity at these surfaces the caulking material Vmight be pushed through.

l attain my object by the devices illustrated in the accompanyingv drawings, in which:

Fig. l is a side elevation of my portable planer; y

Fig. 2 is a bottom view of my planer;

Fig. 3 is an end view of my planer;v

Fig. Il is a sectional detail of the motor,-

and the shaft carried thereby on which the knife-element is ailiXed; Figs. 5 and 6 show respectively, in th order numbered, a top view, and a side elevation of the type lof knife used by me; andy l Fig. 7 diagrammatically illustrates the operation of my planer.

Referring to the illustrative mechanism, the portable planer there shown will be seen each end with a transverse shaft b, on which are mounted arms c, connecting the ends of the sole-plate d tothe body; the sole-plate being made with flanges d', to which the lower ends of the arms c are pivoted, as

as at d2. l Y

Since relative dimensions are of some importance in the successful construction of my planer, l have given dimensions on Fig. 1 to serve as a guide. Saiddimensions' 4to the base of the body a, so that thereby the axis of rotation of the knifel e'will be tilted slightly out of the perpendicular with respect to the sole-plate d, with the resulty that the plane of rotation of the cutting members e of the knife will be at aslight angle to that ofthe surface being lplaned.

Such arrangement causes said cutting mem.

bers ofthe knife to be alternatelyimposed upon, for operating upon the surface being planed, or to beslightly spaced therefrom. ln other words, each cuttingmember'during each revolution of the knife will be at work part of the time and idle the remain- Vto comprise a frame, or body @provided ats-#"- A i vcuttingfmembers are concavedfand each is rant Z.

ing time, and so be given an opportunity of slightly cooling, and, in this way,prevent ing the overheating v'and'loss of temper of the cutting members of the knife, Vand prolonging` theV effective life of the latter.

'Thekni'fe i'sdriven by' amotor f, revolv- 'ingion bal'lbearings g. The motor should preferably be of a suitable air-driven turbine engine type; for example such as described in U. S. Letters Patent No.'1,283',425 to Thomas W. Paxton, dated Oct. 25, 1918. In said motor f, is affixed a shaft h having a .projecting endz/,on which-the knife e is lsecured by a nut'i'.

Thesole-plate l has a circular portion j cut away, under the motor, through whic'hthe knife e is projected onto the work.

The body a, as shown-in Fig. 4, preferablycomprises a base member a anda top vmember 0,2, said base member being formed with a circular chamber into which depends a circular'fiange a3', formed on the under side of said top member. The'motor f lies Ainsuch circularchamber between the outer -wall thereof and said flange as, -and the ball bearings-g, on which it revolves, are interposed between the hub vof said motor and saidflange -In addition ball bearings g', in the top member -a?proper, are provided,

whereinthe upper endl of shaftorspindle h is l` j ournaled.

Y The sole-plate cZ'is moved from-and towards'the base of the body a by means ofga lever c, co--ope'rating with anotched quad-v Handles m and n at the opposite which are convexed, as more clearly shown in Figs. l1 and 6. The upperfaces of said lprovidedwitha cuttingedge, as shownat 1g vand g f By making the lower faces of said'cutting members convex, and by relatively tilting `the axis of rotation ofthe knife, my planer will be lgiven-a tendencyto-make a slightly concaved-'cut, which is ydesirable in certainlclasses of'work, as mentioned, in order to insure that the edges of the surface beingV p'laned will project a trifle above the intermediate surface.

The action of the knife offmy planer diagrammatically represented in Fig. 7', in

which r represents the axis of` rotation of the' knife, s, s," the Vlaterally projecting cut- 'ting members and t the surface being opera ated upon. Y

day of August,

4I claim:

l. In a tool of the character described, the combination of a body, a motor, carried thereby, rotating on a vertical axis, the

shaft of said motor extending below the base of the body, a knife on said extending shaft end, a sole-plate, and means connecting the ends of the sole-plate to said body the base vof the latter, adapted to position the soleplate at a slight angle to said base, thereby causing a relativeV incline of the axisof roc tation of said shaft, for the purpose specified; said sole-plate having a part cut away under saidA motor.

2. In a tool of the character described, the combination of a body, a motor-,carried thereby, rotating on a verticalV axis, tne shaft of said motor extending belowV the base of the body, a knife on said extending shaft-end, a sole-plate, and pivoted arms vconnecting the ends of the sole-plate to said body in approximate parallelism with the base of the latter, said arms being adapted to position the sole-plate at a slight angle to said base, thereby causing a relative Vincline of the axis of rotation of said shaft, for the `purpose specified; said sole-plate having a part cut away under saidvmotor.

3. In a tool ofthe character described, the combination of a` body, a. motor, carried thereby, rotating on a vertical axis, the shaft of said motor extending below the base of the body, a knife on said extending shaftend, said knife having opposite, lateral out ting members, a sole-plate, and pivoted arms connecting the ends of the sole-plate to said body in approximate parallelism with the base of the latter, said arms being adapted to position the sole-plate at a slight angle Y to said base, thereby causing a relative incline of the axis of rotation of said shaft,

yfor the purpose specified; said .sole-plate having a part cut away under said motor.

4. In a tool of the character described, the combination of 'a body, a motor, carried thereby, rotating on a vvertical axis, the shaft of said motor extending below the base of the body, a ,knife on said extendingV shaft-end, said knife having'opposite, lateral cuttingvmembers, the latter having their under faces convex, a soleeplate, and pivoted arms connecting the ends of the sole-plateto said-body in approximateparallelism with the base ofthe latter, said arms lbeing adapted to position the sole-plate at a slight anglev to said base,

thereby causing a relative incline of the 'axis of rotation of said; shaft, -forthe -purpose away under said motor.

VSigned at Portland, Oregon, this 20th GEORGE KRABER.

specified; said sole-plate having a p artcut i y 

